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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 02


    POOL ELEVATIONS  STORAGE     RELEASES       EVAP  INFLOW   RAINFALL
DAY      FT-NGVD     2400HR         DSF        INCHES   ADJ     INCHES
      0800    2400    AC-FT   POWER    TOTAL  8A TO 8A  DSF    7A TO  7A
                                                               DAM   BSN
PRIOR MONTH 1418.74   141220
 1  1418.74 1418.78   141558      0        0   0.170      75   0.00  0.00
 2  1418.76 1418.72   141050      0        0   0.120      75   0.00  0.00
 3  1418.72 1418.72   141050      0        0   0.200      75   0.00  0.00
 4  1418.70 1418.70   140881      0        0   0.270      75   0.00  0.00
 5  1418.68 1418.65   140459      0        0   0.160      75   0.00  0.00

 6  1418.67 1418.69   140796      0        0   0.330      75   0.00  0.00
 7  1418.67 1418.88   142404      0        0   0.360    1000   0.00  0.00
 8  1418.84 1418.92   142743      0        0   0.600     250   2.40  0.77
 9  1418.88 1418.84   142065      0        0   0.270     100   0.08  0.01
10  1418.82 1418.78   141558      0        0   0.230     100   0.00  0.00

11  1418.77 1418.87   142319      0        0   0.180     175   0.03  0.01
12  1419.01 1419.11   144387      0        0   0.560    1000   1.29  1.21
13  1419.13 1419.15   144740      0        0   0.050     400   0.02  0.01
14  1419.15 1419.14   144652      0        0   0.210     100   0.00  0.00
15  1419.15 1419.12   144475      0        0   0.360      70   0.00  0.00

16  1419.16 1419.19   145091      0        0   0.360     300   0.00  0.08
17  1419.26 1419.20   145179      0        0   0.300     150   0.29  0.37
18  1419.20 1419.18   145004      0        0   0.320     100   0.00  0.00
19  1419.18 1419.18   145004      0        0   0.220      60   0.00  0.00
20  1419.18 1419.16   144828      0        0   0.230      30   0.01  0.01

21  1419.18 1419.11   144387      0        0   0.200      20   0.00  0.01
22  1419.09 1419.07   144035      0        0   0.340      10   0.00  0.00
23  1419.12 1419.15   144740      0        0   0.240     450   0.00  0.00
24  1419.18 1419.30   146060      0        0   0.270     800   0.78  0.15
25  1419.31 1419.28   145884      0        0   0.330     250   1.04  0.31

26  1419.29 1419.26   145708      0        0   0.150     150   0.00  0.00
27  1419.28 1419.30   146060      0        0   0.270     100   0.00  0.01
28  1419.30 1419.32   146235      0        0   0.170      80   0.00  0.01
29  1419.32 1419.30   146060      0        0   0.150      60   0.00  0.04
30  1419.31 1419.30   146060      0        0   0.280      50   0.00  0.06
31  1419.29 1419.27   145796      0        0   0.300      50   0.00  0.03

TOTAL                             0        0   8.200    6305   5.94  3.09
AVERAGE  1419.05                  0        0             203 NORMAL= 3.91

MAXIMUM  1419.32      146235   DATE=29    TOP CONSERVATION POOL   1421.60
MINIMUM  1418.60      140035   DATE= 7    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   1845 AC-FT, RELEASED      0 AC-FT

                      INFLOW VOLUME=    12506 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION